Rachel refers to her relationship with Paolo as the complete opposite of her relationship with Barry.
Throughout the relationship, Ross was jealous of Paolo and constantly tricked him into calling himself mean names.
Barry and Mindy get divorced in season six when Barry cheats on Mindy again. A dark, Italian man who could not speak English very well.
Rachel's relationship with Paolo was based merely on sex.
Rachel bizarrely does not see the multiple similarities between Ross and Russ, and even more bizarrely, neither do either of them.
Rachel dates Russ as a rebound relationship after breaking up with Ross upon learning of a list of her pros and cons he had written up whilst trying to decide whether to date her or Julie, but the fact that she would date a man who resembles him so much - even if she hasn't noticed the aforementioned resemblances - seems to strongly imply that she is still attracted to him, and the other friends actually suggest this theory to her.
Rachel dates Joshua Burgin for 5 episodes in Season 4.